The Weather Guard Double Wrap Core is an internal upgrade for spa covers that improves moisture resistance, insulation performance, and long-term durability. Instead of the standard single vapor barrier wrap around the foam core, this feature adds a second layer of protection, designed to reduce the risk of water absorption into the foam, which can otherwise cause sagging, added weight, and decreased insulation over time. This upgrade is particularly useful in climates with high humidity, frequent rain, or wide temperature fluctuations.